How to Create Very Very Special Class with too many magic methods ?

[wavic]

>>> class example():
...     pass

>>> foo = example()

>>> foo.x = 10 # new variable

>>> foo.y = 20 # new variable

>>> foo.sum = lambda a, b: a + b 

>>> foo.sum(10, 20)
30

>>> foo.sum(foo.x, foo.y)
30

>>> foo.x = 20

>>> foo.sum(foo.x, foo.y) 
40

>>> class example2():
...     x = 5
...     y = 7

>>> bar = example2()

>>> bar.x
5

>>> bar.x = 12

>>> bar.x
12

It could be simple as this one. Why to define a method just to change a variable?